In an interview on Saturday, the 41-year-old said he would be comfortable fighting under any format.
RIZIN is run by numerous minds behind PRIDE FC, a now-defunct promotion from the late 1990s and early 2000s beloved by many MMA fans...
Floyd Mayweather has sensationally announced he will fight kickboxer Tenshin Nasukawa on New Year's Eve in Saitama, Japan. As a professional I haven't had a chance to go outside the USA to display my skills and to display my talent for the world'. "And if it takes working with a great guy like this, there's no problem".
"As far as the weight class and rules, we'll talk about that and get it situated within the next couple of weeks", Mayweather said.
Rizin Fighting Federation are co-promoting the fight, which has been dubbed a "Super Challenge" bout. He has not fought since coming out of retirement to defeat Conor McGregor in a boxing bout previous year. "I'm so happy that Mr. Nasukawa accepted this offer in a flash".
"I'm very happy that this is going to materialise".
"I can wrestle, I can wrestle little bit".
And he faces a potentially risky prospect in heralded kickboxer Nasukawa, who warned he has a punch that will "change history". Stay tuned for future news regarding the rules the bout will be contested under, as well as other match-ups for the card. "I can do anything if I set my mind to it". "I look forward to taking this worldwide". "He's young, fast, [has] youth, undefeated like myself, and what the people want is excitement and that's why I chose Japan".
"It's always been a goal of mine to go outside the US and go into another arena and display talent as a professional because I did it as an amateur".